Director/PDMR Shareholding

National Grid PLC
15 June 2007


15 June 2007
National Grid plc (National Grid )

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Notification of Directors' Interests
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Deferred Share Plan


On 14 June 2007, the following directors were granted an award of Ordinary
shares in National Grid (the 'Shares') under the National Grid Deferred Share
Plan, calculated by reference to a share price of 726.87p. The awards will vest
on the third anniversary of the date of grant (June 2010). The shares will be
transferred to participants net of deductions as soon as practicable thereafter.

            Director                                            Number of Shares

          Mr E M Astle                                                    27,927
          Mr M Fairbairn                                                  13,867
          Mr S J Holliday                                                 42,435

          Mr S C B Lucas                                                  29,276
          Mr N P Winser                                                   25,596


The total share interests of the above directors, following these changes, are:


            Director                                            Number of Shares

          Mr E M Astle                                                   628,374
          Mr M Fairbairn                                                 259,378
          Mr S J Holliday                                                577,753
          Mr S C B Lucas                                                 538,609
          Mr N P Winser                                                  435,778

The directors holdings in B Shares in National Grid remain unchanged.


Contact: D C Forward, Assistant Secretary (020 7004 3226)



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